C4 Electronic faucets · Installation | 763 M3-E Installation, use and maintenance 3.3. ELECTRIC SUPPLY FAILURE 4x1.5V LR6AA ALKALINE In ba ttery powered models, the red LED ashes intermittently to show when batteries need to be changed; several days are still remaining for battery replacement. When the intermittent ashing changes this will mean that the batteries are empty and the faucet will not work until the batteries are replaced.